(under subclass 441) Subject matter where the live or exhaust steam comes into contact with the water to be heated. This is a miscellaneous subclass for steam injected feed water heaters not otherwise provided for.
SEE OR SEARCH THIS CLASS, SUBCLASS:
434, 435, 436, 437, 438, 443, and 444, for special types of heaters using steam.
457, and 458, and search note thereunder, for devices mixing water with exhaust steam and returning it to the boiler.
SEE OR SEARCH CLASS
60, Power Plants,
654, for devices for mixing water with exhaust steam and returning it to the boiler of power plants. 210, Liquid Purification or Separation,
198.1+, for separating means with means to add a treating material, e.g., steam.
261, Gas and Liquid Contact Apparatus, for feed water heaters and purifiers not connected with the boiler structure of the steam injected type.
